Sensabaugh tunnel or Rotherwood mansion?

So last night I watched the movie Chernobyl Diaries with some friends and during the conversation of talking about places like Chernobyl or Centralia, Pennsylvania (the movie Silent Hill) one of my friends brings up "Sensabaugh tunnel" and the "Rotherwood mansion" and "five caves". Apparently Kingsport is home to some of the scariest places in the country. I came home last night and did a little research and just as they said, right off of Big Elm Road, which is not far from where I live. My friends have the idea that going and visiting these places one night when the temperature warms up would be a fun experience. Has anyone ever been to any of these places or know someone who has?